Ask HN: Android User Interface Design Resources

Can anyone offer any links, books, or advice related to designing great user interfaces for Android apps?

I've worked my way through Hello, Android and found it to be a great starting point but I feel it was really lacking in basic user interface techniques. Stuff like: How do I put a custom background image on a button and handle state changes? What should I use to animate parts of Views?

So far I've found this presentation which has some pretty good tips:

http://www.slideshare.net/AndroidDev/android-ui-design-tips

and this collection of links which is mostly tool-oriented:

http://speckyboy.com/2010/05/10/android-app-developers-gui-kits-icons-fonts-and-tools/

Also related: does anyone use DroidDraw or similar tools? I'd love to her your impressions.